It was recalled that previous studies had reported the existence of a green photoluminescence band in O-deficient silica glass when exposed to ultra-violet light. The O-deficient defects were thought to be at the origin of this photoluminescence band. The characteristics of a green photoluminescence band in O-surplus silica glass, excited by visible and ultra-violet light, were described here. At room temperature, the full-width at half-maximum and lifetime of this photoluminescence band were observed to be about 0.2eV and 300ns. These differed from the previously reported values of 0.4eV and 20 to 30ns. It was proposed that peroxy radicals or other O-surplus defects were the cause of this green photoluminescence band, rather than O-deficient defects.

Green Photoluminescence Band in γ-Irradiated Oxygen-Surplus Silica Glass. Y.Sakurai, K.Nagasawa: Journal of Applied Physics, 1999, 86[3], 1377-81